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The comparison group with photoelectric alarms had low rates of nuisance alarms (11%) and battery removal (4%). Six months after installation, more than 90% of the homes with ionization-typealarms had experienced false alarms, mostly from cooking, and 19% had been disconnected, presumably because of the nuisance alarms. The authors compared the rate of false alarms (or “nuisancealarms”) between ionization-type and photoelectric-type smoke alarms that had been installed in low-income homes in 4 small villages in Alaska. 2, 3The study by Fazzini and colleagues is particularly relevant for the last group. 2 Some failures are due to malfunction of the alarm itself, some are due to a dead battery, and some do not function because the battery has been removed. In on-sitesurveys of homes with smoke alarms, about 25% to 30% of the alarms did not function when tested. 1 The bad news is that a substantial proportion of those smoke alarms do not work. The good news is that more than 90% of homes in the United States now have at least 1 smoke alarm. Smoke alarms have saved thousands of lives in the United States since their introduction and widespread use during the past 2 decades.

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